Discovering Computers 2008
Chapter 5
Input
Chapter 5 Objectives
Define input
Explain how a digital camera works
List the characteristics of a keyboard
Describe uses of PC video cameras,
Web cams, and video conferencing
Describe different mouse types
and how they work
Discuss various scanners and reading
devices and how they work
Summarize how various pointing
devices and controllers for gaming and
media players work
Explain the types of terminals
Explain how voice recognition works
Describe various input devices
for PDAs, smart phones, and Tablet PCs
Summarize the various biometric
devices
Identify alternative input devices for
physically challenged users
Next
What Is Input?
What is input?

Data or instructions entered into memory of
computer

Input device is any hardware component that
allows users to enter data and instructions
p. 234 - 236 Fig. 5-1
Next
What Is Input?
What are the two types of input?
 Data

Unprocessed text,
numbers, images,
audio, and video
 Instructions



p. 234
Programs
Commands
User responses
Next
The Keyboard
How is the keyboard divided?



Typing area
Numeric keypad
Function keys,
special keys that
issue commands
p. 236 Fig. 5-2
Next
The Keyboard
What is the insertion point?

Blinking vertical bar that indicates where next
character you type will display
p. 237 Fig. 5-3
Next
The Keyboard
What is a cordless keyboard?

Communicate with a
receiver attached to a
port on the system
unit
p. 238 Fig. 5-4
Next
Pointing Devices
What is a mouse?
 Pointing device that fits under palm of hand


Pointing device controls
movement of pointer
Mechanical mouse
has rubber or metal
ball on underside
Click to view Web Link,
click Chapter 5, Click Web Link
from left navigation,
then click Mouse
below Chapter 5
p. 239 Fig. 5-5
Next
Pointing Devices
What is an optical mouse?
 No moving mechanical
parts inside
 Senses light to detect
mouse’s movement
 More precise than
mechanical mouse
 Connects using a
cable, or wireless
p. 239 Fig. 5-6
Next
Pointing Devices
What are common mouse operations?
Point
p. 240 Fig. 5-7
Click
Doubleclick
Drag
Rightdrag
Rotate
wheel
Freespin
wheel
Tripleclick
Press
wheel
button
Rightclick
Tilt
wheel
Next
Other Pointing Devices
What is a trackball?


Stationary pointing device
with a ball on its top or side
To move pointer, rotate ball
with thumb, fingers, or palm
of hand
Click to view Web Link,
click Chapter 5, Click Web Link
from left navigation,
then click Repetitive Strain
Injuries below Chapter 5
p. 241 Fig. 5-8
Next
Other Pointing Devices
What are a touchpad and a
pointing stick?


Touchpad is small, flat,
rectangular pointing device
sensitive to pressure and motion
Pointing stick is pointing device
shaped like pencil eraser
positioned between keys on
keyboard
p. 241 - 242 Figs. 5-9—5-10
Next
Other Pointing Devices
What is a light pen?
 Handheld input device
that can detect light

p. 242
Press light pen against
screen surface and then
press button on pen
Next
Other Pointing Devices
What is a touch screen?


Touch areas of screen with
finger
Often used with kiosks
Click to view Web Link,
click Chapter 5, Click Web Link
from left navigation,
then click Touch Screen
below Chapter 5
p. 242 Fig. 5-11
Next
Keyboard and Pointing Devices
What is a digital pen?


Looks like a ballpoint pen, but uses pressure to write
text and draw lines
Used with graphics tablets, flat electronic boards
Click to view Web Link,
click Chapter 5, Click Web Link
from left navigation,
then click Pen Input
below Chapter 5
p. 242 - 243 Fig. 5-12 and 5-13
Next
Controllers for Gaming and Media Players
What are the types of game controllers?






Gamepad
Joystick
Wheel
Light gun
Dance pad
Motion-sensing
game controller
Click to view Web Link,
click Chapter 5, Click Web Link
from left navigation,
then click Wii Remote
below Chapter 5
p. 244 Fig. 5-15
Next
Controllers for Gaming and Media Players
What is a touch-sensitive pad?

Input device on a portable
media player that enables
users to scroll through
and play music, view
pictures, watch videos or
movies, adjust volume,
and customize settings
 Click Wheel
p. 245 Fig. 5-16
Next
Voice Input
What is voice input?


The process of entering input by speaking into
a microphone
Voice recognition is the computer’s capability
of distinguishing spoken words
Click to view Web Link,
click Chapter 5, Click Web Link
from left navigation,
then click Voice Input
below Chapter 5
p. 245 Fig. 5-17
Next
Voice Input
What is a MIDI (musical instrument
digital interface)?

External device, such as electronic piano
keyboard, to input music and sound
effects
p. 246 Fig. 5-18
Next
Input for PDAs, Smart Phones, and Tablet PCs
How is data
entered into a
PDA?
p. 247 Fig. 5-19
Next
Input for PDAs, Smart Phones, and Tablet PCs
What is a portable keyboard?

A portable keyboard is
a full-sized keyboard
you conveniently attach
to and remove from
PDA
p. 248 Fig. 5-20
Next
Input for PDAs, Smart Phones, and Tablet PCs
What is a smart phone?


Users can input and send text messages,
graphics, pictures, video clips, and sound files
Many have a built-in or attachable camera
p. 248 - 249 Fig. 5-22
Next
Input for PDAs, Smart Phones, and Tablet PCs
What is a Tablet PC?


Mobile computer that
includes handwriting
recognition software
Primary input device is a
pressure-sensitive digital
pen
p. 249 – 250 Fig. 5-23
Next
Digital Cameras
What is a digital camera?
 Allows you to take
digital pictures
 Images viewable
immediately on
camera


Download to
computer
Post pictures
to Web
p. 250 - 251 Fig. 5-24
Next
Digital Cameras
How does a digital camera work?
p. 251 Fig. 5-25
Next
Digital Cameras
What is resolution?
 Sharpness and clarity of image
 The higher the resolution, the better the image
quality, but the more expensive the camera
 Pixel (picture element)
is single point in
electronic image

p. 252 Fig. 5-26
Greater the number of
pixels, the better the
image quality
Next
Video Input
What is video input?



Process of entering full-motion images
into computer
Video capture card is
adapter card that converts
analog video signal into
digital signal that
computer can use
Digital video (DV)
camera records video as
digital signals
p. 253 Fig. 5-27
Next
Video Input
What is a PC video camera and a Web cam?
 PC video camera is used to capture video and still
images, and to make video telephone calls on Internet

Also called PC camera
 Web cam — video camera
whose output displays on
a Web page
c
c
Click to view Web Link,
click Chapter 5, Click Web Link
from left navigation,
then click Web Cams
below Chapter 5
p. 253 - 254 Fig. 5-28
Next
Video Input
What is video conferencing?
 Two or more geographically separated people
who use network or Internet to transmit
audio and video data

p. 254 Fig. 5-29
Whiteboard is
another window on
screen that can
display notes and
drawings
simultaneously on
all participants’
screens
Next
Video Input
Video: A Digital Whiteboard to Make Presentations Roar
CLICK TO START
Next
Scanners and Reading Devices
Flatbed
What is a scanner?
 Light-sensing device that
reads printed text and
graphics

Used for image processing,
converting paper documents
into electronic images
Pen or
Handheld
Sheet-fed
Drum
p. 255 – 256 Fig. 5-30
Next
Scanners and Reading Devices
How does a flatbed
scanner work?
Step 1:
Place the document to be scanned face down
on the glass window. Using buttons on the
scanner or the scanner program, start the
scanning process.
Step 2:
The scanner converts the
document content to digital
information, which is transmitted
through the cable to the
memory of the computer.
p. 256 Fig. 5-31
Step 3: Once in the memory of the computer,
users can display the image, print it, e-mail it,
include it in a document, or place it on a Web
page.
Next
Scanners and Reading Devices
What is an optical reader?
 Device that uses light source to read characters, marks,
and codes and then converts them into digital data


p. 257 Fig. 5-32
Optical character recognition
(OCR) reads characters in
OCR font
Optical mark recognition
(OMR) reads hand-drawn pencil
marks, such as small circles
Next
Scanners and Reading Devices
What is a turnaround document?
 Document that you
return to the company
that sent it

p. 257 Fig. 5-33
Portion you return has
information printed in
OCR characters
Next
Scanners and Reading Devices
What is a bar code reader?

Uses laser beams to read bar codes
Click to view Web Link,
click Chapter 5, Click Web Link
from left navigation,
then click Bar Code Readers
below Chapter 5
p. 258 Fig. 5-34
Next
Scanners and Reading Devices
What is a bar code?


Identification code that consists of a set of vertical
lines and spaces of different widths
Universal Product
Code (UPC)
p. 258 Fig. 5-35
Next
Other Input Devices
What is an RFID reader?
 Reads information on
the tag via radio waves

p. 259 Fig. 5-36
Can be handheld
devices or mounted in a
stationary object
Next
Other Input Devices
What is a magnetic stripe card reader?


Reads the magnetic
stripe on the back of a
credit card
Exposure to a magnetic
field can erase the
contents of a card’s
magnetic stripe
p. 260 Fig. 5-37
Next
Scanners and Reading Devices
What is a magnetic-ink character recognition
(MICR) reader?


p. 260 Fig. 5-38
Can read text printed with magnetized ink
Banking industry almost exclusively uses MICR
for check processing
Next
Scanners and Reading Devices
What is a data collection device?


Obtains data directly at location where transaction
or event takes place
Transmits data over
network
or Internet
p. 261 Fig. 5-39
Next
Terminals
What is a point of sale (POS) terminal?
 Records purchases,
processes credit or
debit cards, and
updates inventory


Swipe credit or debit
card through card
reader
Reads customer’s
personal data from
magnetic strip
p. 261 - 262 Fig. 5-40
Next
Terminals
What is an automated teller machine (ATM)?

Self-service banking
machine that connects to a
host computer through a
network
p. 262 Fig. 5-41
Next
Biometric Input
What is biometrics?
 Authenticates person’s identity
by verifying personal
characteristic


Fingerprint scanner captures
curves and indentations of
fingerprint
Hand geometry system measures
shape and size of person’s hand
Click to view Web Link,
click Chapter 5, Click Web Link
from left navigation,
then click Biometric Input
below Chapter 5
p. 262 - 263Fig. 5-42 and 5-43
Next
Biometric Input
What are examples of biometric technology?
 Voice verification system compares live
speech with stored voice pattern
 Signature verification system recognizes
shape of signature
 Iris recognition system reads
patterns in blood vessels in back
of eye

Biometric data is sometimes stored
on smart card, which stores
personal data on microprocessor
embedded in card
p. 263 – 264 Figs. 5-44—5-45
Next
Putting It All Together
What are recommended input devices for home users?








p. 265 Fig. 5-46
Enhanced keyboard or ergonomic keyboard
Mouse
Stylus for PDA or smart phone
Game controller(s)
30-bit 600 x 1200 ppi color scanner
3-megapixel digital camera
Headphones that include a microphone
PC video camera
Next
Putting It All Together
What are recommended input devices for
small office/home office users (SOHO)?







p. 265 Fig. 5-46
Enhanced keyboard or ergonomic keyboard
Mouse
Stylus and portable keyboard for PDA or
smart phone, or digital pen for Tablet PC
36-bit 600 x 1200 ppi color scanner
4-megapixel digital camera
Headphones that include a microphone
PC video camera
Next
Putting It All Together
What are recommended input devices for mobile users?






p. 265 Fig. 5-46
Wireless mouse for notebook computer
Touchpad or pointing stick on notebook computer
Stylus and portable keyboard for PDA or smart
phone, or digital pen for Tablet PC
3- or 4-megapixel digital camera
Headphones that include a microphone
Fingerprint scanner for notebook computer
Next
Putting It All Together
What are recommended input devices for power users?








p. 265 Fig. 5-46
Enhanced keyboard or ergonomic keyboard
Mouse
Stylus and portable keyboard for PDA or
smart phone
Pen for graphics tablet
48-bit 1200 x 1200 ppi color scanner
6- to 12-megapixel digital camera
Headphones that include a microphone
PC video camera
Next
Putting It All Together
What are recommended input devices for large
business users?










p. 265 Fig. 5-46
Enhanced keyboard or ergonomic keyboard
Mouse
Stylus and portable keyboard for PDA or smart phone, or
digital pen for Tablet PC
Touch screen
Light pen
42-bit 1200 x 1200 ppi color scanner
OCR/OMR readers, bar code readers, MICR reader, or data
collection devices
Microphone
Video camera for video conferences
Fingerprint scanner or other biometric device
Next
Input Devices for Physically Challenged Users
What input devices are available
for those with physical limitations?



Keyguard allows users to rest
hands on keyboard without
accidentally pressing keys
Head-mounted pointer
controls pointer on screen
New developments include
gesture recognition and
computerized implant devices
p. 266 Figs. 5-47
Next
Summary of Input
Keyboard, mouse, and other
pointing devices; controllers for gaming
and media players
Scanners and reading devices
Voice input
Terminals
Input devices for PDAs, smart phones,
and Tablet PCs
Biometric input
Digital cameras
Input devices for physically
challenged users
Video Input
Chapter 5 Complete